The 1st recommended is McPherson's Astaxanthin from the original U.S. imports, the price is $238. The 2nd recommendation is from Revision Astaxanthin, which costs $50. The 3rd recommendation is from Comax, with a corresponding price of $238. The 4th recommendation is from Acemann's, which has a corresponding price of $298. The reason why different brands their corresponding prices will be different, mainly because of their own source of raw materials astaxanthin there are advantages and disadvantages, as well as those who are more expensive often in the latter part of the process of incorporation of the choice of natural types, so corresponding to the safety coefficient will be higher, will not give the human body to bring any side effects, it is more worthwhile to buy. The above is the answer given by individuals on the topic of astaxanthin which brand is effective. In fact, the comprehensive performance of some of the above brands are quite good, if you have better economic conditions, you can choose as much as possible in the more expensive of these brands, because the more expensive it corresponds to the higher quality.